Title :
Control of the washing zone in a continuous digester
Author_Institution :
Dept. of Signal, Sensors, & Syst., R. Inst. of Technol., Stockholm, Sweden
Abstract :
Multivariable temperature and alkali control in the washing zone of a continuous digester is considered. A linear model is identified from a nonlinear digester model, which is obtained by applying the method of orthogonal collocation to a model in terms of partial differential equations. The linear model is used for control design employing the Smith predictor in combination with an H∞ robust stabilization procedure. Simulations using both the nominal and perturbed nonlinear models in combination with both a full and a reduced order controller are performed. Simulation studies show that the proposed control design approach is useful and may prove effective in digester control
Keywords :
H∞ control; control system synthesis; multivariable control systems; pH control; paper industry; partial differential equations; predictive control; robust control; temperature control; H∞ robust stabilization; Smith predictor; alkali control; continuous digester; control design; full reduced order controller; linear model; nominal nonlinear model; nonlinear digester model; orthogonal collocation; partial differential equations; perturbed nonlinear models; reduced order controller; washing zone; H-infinity control; Multivariable systems; Partial differential equations; Predictive control; Pulp and paper industry; Robustness; Temperature control;
Conference_Titel :
Control Applications, 1994., Proceedings of the Third IEEE Conference on
Conference_Location :
Glasgow
Print_ISBN :
0-7803-1872-2
DOI :
10.1109/CCA.1994.381429
